Trotter 540 Amperage Draw Test
Testing the amperage draw on your treadmill can effectively diagnose the
condition of the motor, running belt and relay box. It's a two step process:Step 1: While the treadmill
is running at 3 mph and at zero elevation, press both the UP SPEED and
DOWN SPEED buttons simultaneously. The display should read between 3 and
5 amps. A higher reading indicates that there is a potential problem with
the motor, choke, capacitor, or relay box.

Step 2: Start walking on the treadmill. The display should read
between 11 and 13 amps. A higher reading may indicate that the running
belt and deck should be replaced.Trotter Motor OHM test
Here's a simple way of testing the health of the drive motor of all
Trotter DC models:

Disconnect the motor from the relay box. Using a voltmeter in OHM test
mode, check the ohm reading from the positive and negative leads going
to the motor. The ohm reading should be between .6 and .9. If the reading
is outside this range, there is a problem with the motor and/or motor
brushes.